巻号一覧
15 巻, 7 号
選択された号の論文の9件中1～9を表示しています
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主として熱伝導度変化からの考察西島 寅次1968 年 15 巻 7 号 p. 329-340
発行日: 1968/12/25
公開日: 2009/05/22
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1968 年 15 巻 7 号 p. 340a
発行日: 1968年
公開日: 2009/05/22
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1968 年 15 巻 7 号 p. 340b
発行日: 1968年
公開日: 2009/05/22
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山口 喬1968 年 15 巻 7 号 p. 341-350
発行日: 1968/12/25
公開日: 2009/05/22
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斎藤 俊次郎1968 年 15 巻 7 号 p. 351-355
発行日: 1968/12/25
公開日: 2009/05/22
ジャーナル フリーHydrothermal treatment at 300°C of either Mg-Fe coprecipitate or hydroxide mixture does not yield magnesium ferrite, which however, was found to occur by the addition of small amount of hydrogen chloride under the same conditions.
This could be interpreted in terms of the formation of basic magnesium chloride as an intermediate, which takes part in the acceleration of magnesium ferrite formation.抄録全体を表示PDF形式でダウンロード (3908K) -
原 昭夫, 矢津 修示1968 年 15 巻 7 号 p. 356-362
発行日: 1968/12/25
公開日: 2009/05/22
ジャーナル フリーIt has been required to determine precise mechanical and physical properties of cemented carbides for their extensive applications. This paper presents the results of fatigue tests on several WC-Co cemented carbides. It is generally recognized that the data of fatigue test on hard materials are widely scattered, consequently, it is desirable to represent them statistically. The present authors obtained the most probable S-N equations and computed the S-N-P (P: probability of fracture) curves for each WC-Co cemented carbide. The observation of the fracture surface, coercive force measurement and X-ray diffraction study were made in order to study the fatigue mechanism and the results are briefly discussed.抄録全体を表示PDF形式でダウンロード (3900K) -
鈴木 寿, 林 宏爾, 原 昭夫1968 年 15 巻 7 号 p. 363-368
発行日: 1968/12/25
公開日: 2009/05/22
ジャーナル フリーProperties of WC-TiC-10% Co and β-10%Co alloys containing up to 20 mol% of various carbides, i.e., V4C3, Cr3C2, ZrC, NbC, Mo2C and TaC were studied at room temperature.
The results are as follows:(1) Grain size of the β-phase in β-10%Co alloy is increased by addition of Cr3C2 and V4C3, and is reduced by ZrC, NbC and TaC. Heterogeneous β-phase appears as the amount of ZrC increases. (2) The lattice parameters of β'-phase, i.e., carbide containing β-phase, increase with increasing ZrC, NbC and TaC but decrease sharply with addition of Cr3C2, V4C3 and Mo2C. (3) A large amount of Cr3C2 dissolves into the binder phase, but the other carbides are almost insoluble. (4) The hardness of the alloys is increased by ZrC and reduced by Cr3C2. (5) The strength of the alloys, which is higher in Ni binder than in' Co binder, is decreased remarkably by adding V4C3, Cr3C2 and ZrC, and is improved by Mo2C, NbC and TaC. The strength of the three phase (WC-β-γ) alloys is associated with that of two phase (β-7) alloys, suggesting that the strength of two or three phase alloy is controlled by that of β-phase or of β/γ interface.抄録全体を表示PDF形式でダウンロード (1857K) -
鈴木 寿, 林 宏爾1968 年 15 巻 7 号 p. 369-371
発行日: 1968/12/25
公開日: 2009/05/22
ジャーナル フリーFor developing the high strength WC-10%Co sintered alloy, coarse grained alloys were sintered in vacuum in various manufacturing processes. The grain size was kept constant (2-3μ) in all specimens, because it is well known that the strength of WC-10%Co alloy should reach a maximum around these grain sizes. The transverse-rupture strength was determined on 20 specimens in each alloy system according to ASTM-B406-64.
The results are as follows: The strength of the alloy depends on the carbon content, contiguity, and so forth, even if no micro pore is present in the structure. Under the optimum conditions, the high and low carbon alloys showed the average transverse-rupture strengths of about 350 and 370kg/mm2, respectively. Therefore, it was confirmed that the strength of such a high strength alloy is affected by the carbon content, as already pointed out by the present authors for the ordinary alloys.
It must be mentioned however, that the true strength would be lower than that obtained actually, taking account for the effect of planar loading resulted from the deformation of the surface at which the load was applied on the specimen.抄録全体を表示PDF形式でダウンロード (269K) -
久高 克也, 中瀬 栄一1968 年 15 巻 7 号 p. 372-374
発行日: 1968/12/25
公開日: 2009/05/22
ジャーナル フリーRaw material (5.5μ) and crushed (1.2μ) powders of titanium hydride were mixed with graphite powder and heated at temperatures up to 1600°C in vacuum (10-5 Torr).
Particle size was the only factor governing the rate of carbide formation, provided that the reaction is thermodynamically favorable. It is shown that the adsorbed water was released above 100°C, that titanium hydride is dehydrogenated at 200-700°C, and that titanium carbide is formed from metallic titanium and carbon in solid state above 700°C, accompanied by the formation of carbon monoxide above 1200°C.
The oxygen content increases with decreasing particle size of the raw material. However, the difference in oxygen content due to particle size was found to decrease and disappear from 400°C to 700°C. Oxygen content increased again above 800°C and was proportional to the surface area of the sample powder. It was shown that the higher the reaction temperature, the more increases the combined carbon in the synthetized titanium carbide.抄録全体を表示PDF形式でダウンロード (201K)
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